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Ever sat down with a stack of DVDs or a queue of online TV episodes and watched till your eyes glazed over? If so, you've indulged in "binge-watching," a mostly harmless, and definitely enjoyable, addiction.

"Experts say TV binging is a lot like other pleasure activities like eating or drinking or sex," NBC's Kate Snow said on TODAY. "As you devour the next episode of your favorite show, your mind releases dopamine, the neurotransmitter that causes the feeling of pleasure ... while the forebrain provides checks and balances to guard against overindulgence."